In a stark warning to the West, President Putin said the attack with the intermediate-range Oreshnik missile was in retaliation for Kyiv’s use of U.S. and British longer-range missiles.

STORY: On Nov. 21 Russia struck Ukraine's Dnipro with a new kind of missile.Known as Oreshnik, or hazel tree in Russia, it caused limited damage, according to senior officials. But the first combat use of such a design – which Russian President Vladimir Putin called unstoppable – has drawn scrutiny from Western military experts.